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NATIONAL GEOGRAPHIC MAGAZINE 1981 January Eruption of Mount St. Helens
By National Geographic Magazine
Price: $10.00


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A VERY NICE COPY OF THIS CLASSIC MAGAZINE:
 
Articles in this magazine are as follows
 
Eruption of Mount St. Helens Mountain With a Death Wish
Eruption of Mount St. Helens In the Path of Destruction
Eruption of Mount St. Helens The Day the Sky Fell

Mount St Helens was one of the prime jewels of Northwest USA climbing until it exploded on may 18, 1980. Half this issue of NG is devoted to the eruption.

Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles (154 km) south of Seattle, Washington and 50 miles (80 km) northeast of Portland, Oregon. Mount St. Helens takes its English name from the British diplomat Lord St Helens, a friend of explorer George Vancouver who made a survey of the area in the late 18th century. The volcano is located in the Cascade Range and is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire that includes over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows.

Mount St. Helens is most famous for its catastrophic eruption on May 18, 1980, at 8:32 am PDT which was the deadliest and most economically destructive volcanic event in the history of the United States. Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles (24 km) of railways, and 185 miles (298 km) of highway were destroyed.
 
A massive debris avalanche triggered by an earthquake measuring 5.0 on the Richter scale, caused an eruption, reducing the elevation of the mountain's summit from 9,677 ft (2,950 m) to 8,365 ft (2,550 m) and replacing it with a 1 mile (1.6 km) wide horseshoe-shaped crater. The earthquake was caused by a sudden surge of magma from the Earth's mantle. The debris avalanche was up to 0.7 cubic miles (2.9 km3) in volume. The Mount St. Helens National Volcanic Monument was created to preserve the volcano and allow for its aftermath to be scientifically studied.

As with most other volcanoes in the Cascade Range, Mount St. Helens is a large eruptive cone consisting of lava rock interlayered with ash, pumice, and other deposits. The mountain includes layers of basalt and andesite through which several domes of dacite lava have erupted. The largest of the dacite domes formed the previous summit, and off its northern flank sat the smaller Goat Rocks dome. Both were destroyed in the 1980 eruption.
 
 
OTHER ARTICLES:

The Indomitable Cockroach
Poland' s Proud Mountain People Poland' s Mountain People
Ancient Ashfall Entombed Prehistoric Animals Pompeii of Prehistoric Animals
in Nebraska
 
Dwarfing the St. Helens Eruption

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